Sigma 28-70mm f/2.8-4 DG Aspherical Large Aperture  Zoom Lens for Sigma SLR Cameras Ideal for digital SLR cameras Multi-layer lens coating and lens design reduces flare and ghosting Minimum focusing distance of the lens is 19.7 inches throughout the entire zoom range Overall length of 2.5 inches and weight of 9 ounces Features aspherical lens elements are used for excellent correction of distortion